Goldwave is an excellent program for Windows for processing/displaying sound files. It is shareware.
Jeremy Ward says: I used a microsoft free SST for my senior design project. I liked it's simplicity and features. I thought some of your students might be interested in it so here it isK: http://www.research.microsoft.com/srg/
Vincent Vigna says: Here is the web site to the free ware PC spectrogram utility I promised you in the previous class. The software is called 'Spectrogram'. It's really a nifty utility. http://www6.zdnet.com/cgi-bin/texis/swlib/hotfiles/info.html?link=1&fcode=000I04
Vincent Vigna also says: Another useful utility for those who may not have Matlab at home is 'waveflow'. 'Waveflow' is free ware that allows users to view, modify, and filter time waveforms of WAV files. It's easy to use, install, and remove plus it has a GUI interface that allows users to easily filter all or part of of the signal by simply highliting the waveform. Here is the web site: http://www.eupmt.upc.es/~cirvidf/download.htm
Marc Boillot says: seems like the free toolbox has some cool M files like Makevowel.m,FMpoints.m, whitevowel.m, and so on. Thought you'd find some interest in its applications as do I. see you in the movies. There is a new Matlab speech toolbox that is available for free. More information, documentation, and downloading links are available at http://web.interval.com/papers/1998-010/
Tom Reinke says: Here is a link to a web site that is guarded with a password. I don't know how secure this will be. I'll have to check and see what happens if a browser doesn't support scripts. The site is http://grove.ufl.edu/~reinke/psword.html The password is phoneme.
Mark Skowronski says: Here's a handy Matlab toolbox for speech processing: http://www.ee.ic.ac.uk/hp/staff/www/voicebox/voicebox.html A few functions I found handy: readsph-read SPHERE/TIMIT waveform files, rfft-returns fft for omega between 0, pi for real input, activlev-calculates active level of signal, based on ITU-T P.56. There's also a monochrome spectrogram function, Rosenberg model of glottal waveform, and functions for generating combination and permutation vectors. About 60 functions in all.